6-methoxy-5-methylspiro[1-benzofuran-3,3'-indol]-2'(1'H)-one 、
乙腈 以
甲基叔丁基醚 为溶剂,
以(3S)-6-methoxy-5-methylspiro[1-benzofuran-3,3′-indol]-2′(1′H)-one was isolated as a crystalline colorless solid (0.96 g, 89% recovery)的产率得到(3S)-6-methoxy-5-methylspiro[1-benzofuran-3,3'-indol]-2'(1'H)-one